Ventilating fan



June 1 1926.

J. D. PARKER VENTILATING FAN Filed Ot. 28, 1925 3 Sheets-Sheet 1 INVENTOR qgvles. D. Parken ATTORNEY June 1 1926. v 1,587,031 J. D. PARKER VENHLATING FAN Y Filed oct. 28, 1925 s Smets-sheet 2 FIG. 4.

INVENTOR James. D. Parker:

ATTORNEY J. D. PARKER VENTILATING FAN Filed oct. 28 1925 s sheetsshaet s FIG. 8..

INVENToR dignes.' D.v Parker.'

ATTORNEY Patented June 1, 1926.

UNITE STTS VENTILATING FAN.

Application filed October 28, 1925. Serial No. 65,312.

The invention relates to improvements in fans for ventilating buildings and mines and circulating air for heating buildings and drying lumber, grain, coffee and the like. And more particularly to certain improve ments in aparticular type of fan commonly known as a. cone or conical fan and sometimes called a conical hemispherica-l fan as the cutting edges of the blades are frustum shaped and the discharge edges are spherical.

The fan as heretofore built has not attained that highstatc of perfection desired by the applicant, owing to the employment of a hub comprising a hollow conical disk integrally connected at its apex to a sleeve which in turn is integrally connected to a disk approximately flat but slightly spherical. The base or hollow side of the conical portion of the disk is presented to the advancing air that is drawn by the suction side vof the fan and creates not only a resistance, but also a back current commonly called back lash. When the air passes over the conical shaped disk it must, after rolling through the space between the two disk portions of the hub into which the blades do not cut, encounter the tiat spherical disk of the hub, and then after the air has completely passed the hub there is a back current or bask lash of the air against the flat spherical disk portion of the hub. These back currents or back lash not only lowers the eliiciency of the fan by reducing the volume of air the fan would move were the hub fan shaped7 but a considerable undesirable noise is set up by the back current or back lash of the air.

- The present invention has provided a fan that is all fan vtrom the sleeve portion of the hub outwardly, by removing the conical disk and the iiat spherical disk and providing a hub that is also a fan from the sleeve portion of the hub outwardly.

A further improvement in the fan is accomplished by extending the inner ends of the blades and causingthem to meet the sleeve portion oli' the hub, thus removing and eliminating all reverse currents and back lash, and also all objectionable noise.

lith these and other objects in view, the invention consists in the 'features of construction, combinations, and arrangements side of the fan.

Fig. 3 is .a view ot the discharge and delivery side of the fan.

Fig. 4 is a perspective vie-w of the fan illustrating the blades extended and meeting the sleeve part oli' the hub, and the clear space through the hub for the passage of air.

Fig. 5 is a view in side elevation of the improved hub of the fan.

Fig. 6 is an end view of one wing of the hub and a slightly angular end View of a second wing, the remainder of the hub being broken away.

Fig. 7 is an end view of the hub.

Fig. 8 is an end View of the hub with all but one of the wings'broken away.

The vtraine l bearing boxes 2, ring shaped yokes 3, brackets 1l, auxiliary hub 5, radial arms 6, ring 7, and shaft 8 are all of common and well known construction, the pulley 9 being shown merely as one means of driving, as it .is often replaced by other driving means, as direct connected motors, engines and the like, the parts being illustrated merely to show an example of' common usage.

The hub l0 is rigidlymounted on the shaft CSE 8, the set screw 11a being illustrated as one means of securing the hub tothe shaft.

The hub l0 is bored to receive the shaft 8 and comprises the elongated cylindrically ends of the wings 13' converge considerably outwardly in opposite directions from the axis ot the hub, and the wings 12 connect the wings 13 to the sleeve 11 so that no air can pass underneath the wings and so that the wings of the hub actually act as fan blades.

The wings 13 are provided with the holes 14 for the purpose of bolting the blades 15 and braces 16 and 17 thereto by the. bolts 18.

The ring 7 disposed concentrioally to the shaft 8, the radial lines ot the ring forming right angles with the shaft, the hub 10 vbeing positioned on the shaft at some dist-ance vfrom the ring.

The braces 16 are approxin'iately straight and connected rigidly from the ring to the near end oi the hub 10 forming lan angle converging outwardly at the hub from the axis ot' the shaft to the ring.

The braces 1.7 connect rigidly from the outward end of the hub 10 to the ring 7 and lay approximately each in a common plane with the axis o1 the shaft but bow considerably outwardly, the blades 15 being secured to the braces 16 and 17.

The ends ot the blades 15 are spaced apart at the ring 7 by the braces 16 `and 17 but overlap at and near the hub 10 the latter ends ot the blades reaching and meeting the sleeve 11.

The tan rota-tes in the direction ot the arrow Fig. 3, the edges 19 of the blades 15 being held rigidly straight by thel braces 16, and cutting the air that is to be moved, the `edges 20 of: the blades 15 being held rigidly in a bowed position by the braces 17 and pushing the air through and from the fan, the blades being in action to the sleeve portion 11 ot the hub 10 so that there is no reverse current or 'back lash at the center of the tan.

The blades 15 and braces 16 and 17 at and near the ring 7 as illustrated in the drawing and described hereinbetore are not new and not intended to be covered by the appended claims.

The hub 10 comprising the sleeve 11, the wings 12 and 13, and the blades 15 and braces 16 and 17 at and near the hub 10 are new and have provided agreat improvement in the performance of the tan.

By providing van improved hub and extending the blades 15 and braces 16 and 17 to the sleeve portion of the hub 10, the eliiciency ot' the tan is materially increased and all back currents, back lash and objectionable noise has been eliminated.

Having described my invention, what l forming a straight line crossing said cylindrically shaped sleeve near the. center ot the length of said sleeve and converging laterally from the' axis oiZ said hub at each end thereof. a flat rectangularly shaped wing mounted on each ot said spirally shaped wings, each oit said flat rectangularly shaped wings disposed radially from the axis of said sleeve near the center of the length of said wing and said sleeve, the ends of said rectangular wings converging in opposite directions from the axis of said sleeve,said sleeve and said spiral wings and said dat rectangular wings formed integrally, a blade secured to4 each of said rectangularly shaped wings, the cutting edge ot eachV blade disposed in a straight line from said wing to said ring and secured thereto, the discharge edge of each ot said blades bowed outwardly and connected to said ring, and said blades conforming to the shape ot said ring at their outer ends.v

2. In a fan, a hub comprising a cylindrically shaped sleeve provided with a plurality of wings, said wings disposed spirally around and along said hub, said wings changing to a fiat rectangular shape, blades secured to said rectangular shaped wings and leaning angularly therefrom around the axis ot said hub, the outer ends of said blades supported concentrically around the axis ot said hub, the cutting edges of said blades forming a frustum shape and the discharge edges ot said blades -forming a spherical shape.

3. A tan provided with a plurality oi blades, one end ot said blades disposed concentrically to the axis of rotation of said tan, in combination with av cylindrically shaped hub disposed concentrically to the axis of rotation of said tan, said hub comprising a sleeve provided with spirally shaped wings, said spirally shaped wings having mounted thereon fiat rectangularly shaped wings, said blades secured at their opposite ends to said rectangularly shaped wings, the cutting edges of said blades forming a rustum shape, and the discharge edges ot said blades forming a spherical shape.

JAMns D. PARKER 

